The Basics of Bobbins
Bobbins are an essential component of a sewing machine. They hold the bottom thread in place and work to create a stitch alongside the sewing machine’s top thread. Bobbins are available in a variety of shapes and sizes, and the modern machines can have detachable or built-in models that come in metal or plastic materials.
Flat Top Bobbins
The flat-top bobbin is a classic variation that sits on a cylindrical shaft. This type is compatible with sewing machines that have a hook-and-bobbin system. The flat top helps sewers to wind the thread with ease, and it prevents it from jumping off the chamber. Flat-top bobbins are highly versatile, and its presence in households worldwide indicates that it is a reliable option for sewing different materials.
Convex Top Bobbins
In contrast, the convex top bobbin sits at an angle that bulges slightly from the center. Machines with a vertical shuttle hook system usually work well with this type of bobbin. The convex top helps the bobbin to spin freely, which is important for consisitent stitch formation. It’s not uncommon for some industries such as the automotive sector, upholsterers or leatherworkers to use convex bobbins.
Purposes
In general, the type of bobbin used does not affect the final quality of the seam. However, the choice often depends on the sewing machine model available or personal preference. Flat-top bobbins are a common sight in domestic setups, as they work with most machines and are easy to find. Convex bobbins are less common and cater to specific industries with high volume sewing needs.
Choosing the Right Bobbin
When choosing a bobbin, the size is essential. Using an incorrect size or an incompatible model can cause bobbin malfunction, resulting in a lousy seam line. It’s important to follow the machine manual or contact the manufacturer to know the necessary bobbin type and size for your sewing machine. Additionally, always use high-quality bobbins as they are more durable and prevent snagging or jamming in the machine.
